10 



Journal of the Mitchell Society 



September 



No attempt was made to study the 8j)orozoa. 



The second part was the presentation of a number of 

 rare forms which had not yet been identified by the 

 writer. Among these rare forms was a species of Tin- 

 tinniis observed in the Plankton Collections* of Chesa- 

 peake Bay (fig. 1). It bears the characters of the genus, 

 with the following specific characters : 



Length 0.275 mm. Diameter 0.05 mm. 



Cylindrical with corrugated constriction near the in- 

 terior end ; nucleus single. 



It was observed but once in some four hundred col- 

 lections averaging about 2,000 individuals per collec- 

 tion. Found in a bottom collection (23.79 meters) taken 

 just ofiF Cape Henry, July 9, 1920. 



Fiu. I 



Neiv Dyes Derived from 5-Chloro-2-amino-p-cijmene. A. S. Wheeler 

 and I. V. Giles. 



A new series of dyes was obtained by coupling the diazo salt of 

 5-chloro-2-amino-p-cymene w'ith the following compounds: 1, Beta- 

 naphthol (dyes wool scarlet) ; 2, Alpha-naphthol- (dyes wool claret 

 brown) ; 3, Phenol (dyes wool capucine yellow) ; 4, Salicylic acid 

 (dyes wool Mars orange) : 5, Resorcinol (dyes wool Brazil red); 6, 

 Alpha-naphthol-2-sulfonic acid (dj^es wool burnt Sienna) ; 7, Beta- 

 naphthol-7-sulfonic acid (dyes w^ool scarlet) ; 8, Alpha-naphthol-4- 

 sulfonic acid (dyes wool scarlet). Silk dyeings show different shades 

 from those indicated for wool. 



A "Nature-Experiment" on the Development of Frogs and One on 



the Physiology of Sponges. H. V, Wilson. 



In an artificially inseminated batch of eggs of Hyla pickeringii, 

 a large number exhibited an abnormality which may with justice be 

 reasoned from as if it were the result of a planned experiment. In 

 these embryos the tail begins to grow out as a pair of buds at a 

 time when the exposed yolk area is so large that in side view it forms 

 one-third to one-fourth the total circumference. Except in the mid- 

 dorsal region where the archenteron has an actual aperture there is 



* Collections taken by the U. S. Fisheries for a Biological and Hydrographical Survey 

 vhich is as yet incomplete. 



