April 11, 1902.] 



SCIENCE. 



571 



prehensive outline of human knowledge, 

 showing- the relations existing among its 

 several branches, and giving the student a 

 correct sense of the proportion between 

 what he knows and what there is to know. 

 Employing the scientific method, it teaches 

 how to observe. College training in it is 

 continued directly in subsequent experience 

 Avith the world. The material is ever at 

 hand. Dealing with the vital problems of 

 all epochs, it inculcates breadth of mind 

 and develops the reason. It induces con- 

 sideration and awakens appreciation of 

 other men and other races. It supplies an 

 available touchstone of truth and error. 

 Wherefore it is that a new and deeper 

 meaning now abides in the words: 



" Know, then, thyself ; presume not God to scan ; 

 The proper study of mankind is man." 



Frank Rqssell. 



AMERICAN MORPHOLOGICAL SOCIETY. 



11. (i^ni) 



Notes on Cyanea Arctica: Chas. W. Hae- 



GITT. 



The early cleavage phases are passed 

 while the eggs are still within the gonads 

 or in the complicated folds of the manu- 

 brium. A gastrula is formed, following 

 total cleavage, by invagination, and an 

 early closure of the blastopore ensues. The 

 embryo becomes ciliated before its escape 

 from the egg membrane, within which it 

 may be seen slowly rotating. On emer- 

 gence it is almost spherical but soon as- 

 sumes the ovoid shape characteristic of the 

 Coeleuterate planula. While details as to 

 the formation of the entoderm are not yet 

 complete they seem in the main to confirm 

 the observations of Hyde, Smith and the 

 recent work of Hein. 



The encystment noted by Hyde and Mc- 

 Murrich has been common in the specimens 

 under consideration, though I have been 

 able to show that the process is rather in- 



cidental than essential as claimed by Mc- 

 Murrich. It seems wholly conditioned 

 upon the environment ; where favorable 

 and natural the process is rare or absent. 



The scypliistoma stage of development 

 was attained in variable periods depending 

 again upon conditions. Under favorable 

 conditions it may occur in from eight to 

 ten days, while under other conditions it 

 may not take place within as many weeks. 

 Thus also with the changes involved in 

 strobilization and the release of the 

 ephyrje. Under favorable circumstances 

 they have taken place in the aquarium 

 within a period of eighteen days from the 

 escape of the planula to that of the ephyra. 



Stolonization occurs as in Aurelia, but 

 much less freely, as does also the origin 

 of buds from the stolons. Budding from 

 the side of the polyp was not observed in 

 Cyanea, its small size probably rendering 

 such process difficult. 



The entire life history from the egg to 

 the free ephyra was followed in detail with 

 unusually good results in aquaria of vary- 

 ing size from a mere watch glass or petrie 

 dish to jars holding a gallon or more. 



Notes on the Ccelenterate Fauna of Woods 

 Eoll : Charles W. Hargitt. 



Inheritance of Color Among Pointers: 

 Frank E. Lutz and Elizabeth B. 

 Meek. 



Dr. Francis ' Galton ( '89 ) proposed 

 ' briefly and with hesitation ' a statistical 

 law of heredity applicable to bisexual de- 

 scent. Briefly stated, it was that one half 

 the offspring's characteristics are derived 

 from the parents (an equal amount from 

 each), one fourth from the grandparents, 

 one eighth from the great-grandparents, 

 one sixteenth from the great-great-grand- 

 parents, and so on. Galton himself ('97) 

 tested this hypothesis by the consideration 

 of a single color characteristic— the condi- 

 tions of being tricolor or non-tricolor— in 



