69 



of a winged Aphis constitutes but a single generation. This ex- 

 planation by a species of budding seems far more satisfactory 

 than that which supposes that either cells or nuclei of the first 

 individual are transmitted by successive inclusions to the last. 

 As this latter idea cannot be supposed to be the result of direct 

 observation, and as no proof is adduced that identical cells and 

 nuclei really pass from one generation to the other, the whole 

 stands merely as an ingenious theory ; while Dr. Burnett's ex- 

 planation (and this view is not proposed for the first time by him,) 

 is in accordance with direct observation. But, in accepting his 

 view, we are compelled to admit the hypothesis, that the ger- 

 minating force imparted to the first ova is transmitted to the suc- 

 cessive broods without the aid of spermatozoa. 



" On the microscopic appearances presented in the intestinal 

 discharges and muscular fibres of a patient who died of the epi- 

 demic cholera.^^ 



" Tissue and its retrograde metamorphosis.^' 



" On the Geology and other points connected with the natural 

 history of Florida.''' 



" Considerations on a change of climate hy northern invalids^ 

 a7id on the climate of Aikin^ S. C." 



" Considerations of some of the relations of climate to tuber- 

 cular disease.^'' 



To these should be added his various critical notices of recent 

 scientific publications in Silliman's Journal, which, in view of the 

 short time he occupied the position of associate editor, were quite 

 voluminous, and serve to give us a good idea of his powers of 

 analysis and discussion. 



There is no one of his productions, which embodies more of 

 the results of his labors, than the prize dissertation, consisting 

 of two hundred closely printed octavo pages, presented to the 

 American Medical Association in the year 1851, and entitled 

 " The Cell, its physiology, pathology and philosophy, as deduced 

 from original observations ; to which is added its history and 

 criticism. ' Natura in minimis maxima est."* " 



To those who are acquainted with modern physiology, it will 

 be seen at once that he had selected a great subject, one which 

 even the most accomplished minds might approach with distrust. 



