ZOOLOGY AND BOTANY, MICEOSCOPY, ETC. 683 



readily acted on by sulphuric acid and glacial acetic acid. To the 

 former group belongs Bougarel's erytbropbyll, which, appears to be a 

 constant accompaniment of chlorophyll ; while to the second group 

 belongs xanthophyll, which is probably in many cases a mixture of 

 tvvo different crystallizable substances. 



Crystalloids in tlie Pyrolaceae.* — 0. Eaunkjaer finds in Pijrola 

 and allied species crystalloids which exhibit the chemical reactions of 

 protein, especially in the receptacle, but also in the leaves, stem, and 

 rhizome. They may be arranged, according to their form, into two 

 groups. In the first (Pyrola uniflora, secunda, and rotundifolia) the 

 crystalloids have the ordinary tabular form, and frequently quite 

 replace the nucleus ; occasionally two are found. They develope in 

 the nucleus only with advancing age. In P. secunda and rotundifolia 

 they were found only in the floral organs. In the second group 

 (P. chlorantha and minor and Chimophila umhellata) the crystalloids are 

 hexagonal, often somewhat elongated, but not tabular. 



Inulin in the Artichoke.j — Pistone and de Eegibus find in the 

 bracts of the artichoke, Gynara Scolymus, a substance identical with 

 the spherocrystals of inulin of Sachs, turning the plane of polarization 

 to the left, even in the presence of a dilute acid, and not coloured by 

 iodine. 



Mentzelia Isevieaulis as a Fly-catcher.:}: — M. E. Jones, acting 

 upon Dr. Gray's suggestion, examined this plant, with the following 

 interesting results: The leaves are thickly beset with coarse hairs, 

 which are furnished with several pairs of barbs pointing downward 

 along them, while the top has an anchor-shaped summit twice as 

 large as the other barbs. These hairs stand so close together that 

 the barbs almost touch. Thickly studding the leaf were many dead 

 and dying mosquitoes, species of Aphis, and other small insects. 

 Some of these were caught by the head, but most of them were held 

 by the proboscis, as their heads were too large to slip between the 

 barbs. All were more or less mutilated, probably by other insects. 

 A sweet fluid was secreted by the leaf, and this attracted the insects. 

 There was no evidence of any digestion going on, as none of the 

 victims could get close enough to the surface of the leaf to be touched 

 by the fluid. 



B. CBYPTOGAMIA. 



Rabenhorst's Cryptogamic Flora of Germany, &c. — The second 

 volume § of this important publication includes the marine algte, the 

 preparation of which has been entrusted to F. Hauck. After an intro- 

 duction on the preparation and collection of seaweeds, the primary 

 classification of marine alg^ (excluding diatoms) is given in four 



* Vidensk. Meddel. Naturh. Foren. Kjobenliavn, 1882, p. 70 (1 pi.). See 

 Bot. Centralbl., xiv. (1883) p. 267. 



t Giorn. Accad. Med. Turin, xlv., p. 560. See Bot. Centralbl., xiii. (1883) 

 p. 365. 



X Bull. Torrey Bot. Club, x. (1883) pp. 69-70. 



§ See this Journal, i. (1881) p. 78. 



