240 TEE ZOOLOGIST. 



are discarded, and sexual selection as proposed by Darwin is 

 given scant recommendation. We are struck with one conclusion 

 enunciated by Prof. Morgan : " The return to Darwin's method 

 rather than to Darwin's opinions marks the beginning of the 

 new era." 



This book is very fully and excellently illustrated. 



The Care of Home Aquaria. By Eaymond C. Osbukn, Ph.D. 

 Published by the New York Zoological Society. 



All publications on this subject are welcome, for we fre- 

 quently find a new hint in management, and in an American 

 guide we are introduced to fish and other animals outside our 

 fauna which are not impossible to obtain for our own aquaria. 

 Moreover, this communication is very fully illustrated, so that 

 we can judge what are really desiderata. 



Dr. Osburn states that " it was not until 1850 that the first 

 properly balanced aquarium was described by Mr. Eobert 

 Warrington, of Manchester, England, in a paper entitled ' On 

 the Adjustments of the Eelations between the Animal and 

 Vegetable Kingdoms by which the Vital Functions of both are 

 permanently maintained.' ' It may be well in this notice to 

 supplement that reference. The author's name is to be spelled 

 " Warington," and his paper was published in the ' Zoologist,' 

 vol. viii., p. 2868 (1850), though it may have appeared else- 

 where, as in a footnote he writes, " Since the reading of this 

 paper" (which we believe was before the Chemical Society). 

 Warington also published another paper, also referred to by Dr. 

 Osburn, entitled "On Preserving the Balance between the Animal 

 and Vegetable Organisms in Sea Water " (' Zoologist,' vol. xi., 

 p. 4118 (1853), which, however, had been previously read at the 

 Hull Meeting of the British Association, and also printed in the 

 Ann. & Mag. Nat. Hist, for November, 1853. 



Dr. Osburn gives some good directions for " clearing the 

 aquarium," but although he refers to Tadpoles and freshwater 

 Snails as scavengers, he does not advocate the use of the fresh- 

 water Mussels, one of which (Unio tumid us) is used by some 

 keepers of aquaria with great success in this couutry. 



