July, 1914 A PLEA FOR COMPARATIVE OOLOGY 167 sity, from delicate pinks and blues to dark olive-browns. Among the Turdinae we find that eggs of the twenty or more North American forms all have as ground color some shade of green or blue, but this is not common to all the true thrushes; in T. viscivorus it varies greatly from gray or greenish gray to red- dish-brown; eggs of M. olivacea from South Africa are similar while in one species only (Oreocichla mollissima) it is white. Doubtless most of the facts and speculations set forth above are familiar to readers of Tn? CONDOR and, l?ving little claim to originality, my only excuse in presenting them is an earnest belief that the time has come in this country when the study of egg collections as a whole should receive more attention and, particularly, that our collecti. ons should be so built up and expanded as to guar- antee the most fruitful results. U.S. S. Washington, Puert.o Plata, Santo Domingo, May zo, ?9?4.
