��THE POPULAR SCIENCE MONTHLY.
��the African cowry, for, while the latter was simply a shell with a hole in it, wampum was a manufactured article, made with a degree of patient labor which was included in estimating the value given to it. That to which the most value was attached was made from the dark part of clam-shells. An inferior M coinage " was made from the white parts of the shells, and from peri- winkle-shells. The value of wampum was almost as well defined as that of our own money, and regular tests were in use for judging of it. Shell money was also used by the Indians of the Pacific slope ; and Mr. Ingersoll describes three kinds of it, all somewhat different from genuine wampum.
Mr. Ernest Hart, Chairman of the Lon- don Smoke Abatement Institute, remarks that at the recent exhibition by that society improvements in the construction of open fire-places were shown by which common bituminous coal can be consumed in a prac- tically smokeless manner. Simple methods of underfeeding were exhibited which proved to be productive of admirable result's both in respect to economy of fuel and reduction of smoke from ordinary coal. Mr. Hart recommends as an elementary measure of economy the use of equal quantities of coke and coal mixed. He has great expectations of the realization of Dr. Siemens's projects for using gas as a heating agent.
The French Academy of Sciences has had a discussion about busts. It was in- vited to witness the progress of the bust of Leverrier, and express an opinion as to the quality of the resemblance and the work. M. Bertrand took the opportunity to speak of the scandalous badness of some of the busts in the hall of the Academy, particularly of those of Delaunay and Claude Bernard, which, he said, were mere carica- tures, and to advice that they be turned out at once ; and M. Dumas remarked that sev- eral of the busts were in reality only fit to be used for making carbonic acid.
Mr. Cromwell Fleetwood Varlet, F. R. S., an English engineer distinguished for his work in connection with electric tele- graphs, died September 2d. He devised a method of locating distant faults in land telegraphic wires, and was associated with other engineers in devising the first really successful Atlantic cable.
The curious question has been raised in England whether the recent decline in the death-rate has actually added to the average length of useful life, or whether its bene- fits have not chiefly been spent in relatively unimportant prolongations of the lives of children and of the aged. It has been an- swered by Mr. Noel A. Humphreys, after a new examination of the returns of mor- tality, and the compilation of new life-tables.
��ne finds that the average expectation of life of males at birth has been raised from 3991 years, as it was fixed in Dr. Farr's tables, to 41 92 years by the new tables, or has been increased by two years, or five per cent ; and that the expectation of females has been raised from 40*86 years to 43*56 years, or by 2'70 years, or nearly 1 per cent.
Charles F. Parses, Curator of the Acad- emy of Natural Sciences of Philadelphia, died September 7th, after a long illness. He had considerable distinction as one of the leading botanists of America, and had paid special attention to the botany of New Jer- sey.
Professor C. Y. Riley, in a paper read at the American Association recommends emulsions of petroleum to be applied to plants as insecticides. A soap emulsion of twenty parts of scraped bar-soap, ten parts of water, thirty parts of kerosene, and one part of fir-balsam, is stable enough for all . practical purposes, but milk emulsions are better. One or two parts of refined kero- sene to one part of sour milk is quite satis- factory. It must be churned till a butter is formed, which is thoroughly stable, and will keep indefinitely in closed vessels, and may be diluted at pleasure with water when needed for use. An emulsion of gum from the root of Zamia inter/) if oM a, of Florida, has proved useful. The diluted emulsion, of strength varying according to the plants and insects to which it is applied, should be finely spraved upon the insects to be killed.
Science has furnished another victim to African sickness in the person of Mr. Will- iam Alexander Forbes, Prosector to the Zoological Society of London, whose death on the Niger River has been reported. He made an excursion to the forests of Pernam- buco, Brazil, in 1880, afterward passed some time in the United States, and started from England for Africa and the eastern tropics, in July, 1882. His published works consist chiefly of about sixty papers in the " Pro- ceedings of the Zoological Society " and the "Ibis."
M. Engelman has been studying the man- ner in which the movements of the lower organisms are influenced by light. He finds that light may act in three ways : 1. Direct- ly, by a modification of the exchanges of gases ; 2. By modifications of the sensation of respiratory necessities, and, 3. By means of a specific special process corresponding probably in some sort to our luminous per- ception.
Mr. Thomas Plant, a life long student of meteorology, died in Birmingham, Eng- land, about the 1st of September. His regu- lar records of the weather and associated phenomena are complete for forty-six years.