■Z601.0G,Y AND BOTANY, MICROSCOPY, ETC 95 



of that first mentioned by virtue of the addition of cut barley-spines to 

 the food of the sheep, which was sprinkled on the soil covering the 

 graves ; in this instance two, instead of one, out of four sheep died. 

 The tendency of the rough fibre to ii'ritate the mucous membrane and 

 facilitate the action of the germs is paralleled by the apparently 

 similar action of stubble, which is shown by the increase of mortality 

 among sheep when placed among it. __ 



Intravenous Injection of Symptomatic Anthrax as a means of 

 Immunity.* — Messrs. Arloing, Cornevin, and Thomas, referring to 

 this disease, which has lately been described by them as distinct from 

 anthrax proper, state that it differs from that disease in producing 

 merely discomfort, with want of appetite and slight fever, lasting 

 from one to three days, when simply injected in solution into the 

 jugular vein (in the calf, sheep, and goat). On testing the animals 

 thus injected from five to twenty days previously by inoculating 

 the muscles with the bacterium, it was found that no anthracic 

 tumour was produced, but merely an abscess containing the bacterium 

 in an active state. Thus an immunity against the disease is conferred 

 by intravascular injection, but it must be performed some days before- 

 hand, or the subject will die. It appears that one injection will 

 mitigate the minor effects of a second one, and the more numerous 

 the injections the greater is the success which is attained in this 

 respect. 



Algae. 



Algae of the Hercules Warm Spring.f — Dr. K. Mika enumerates 

 the following as the algal vegetation of the well-known warm spring 

 of the Hercules Bath, near Mehadia, viz, 19 species in all, including 

 5 of Oscillaria and 4 of Beggiatoa. In the spring itself only those 

 species can exist which are characteristic of sulphiu'etted water ; in 

 the outflow these are mingled with species which thrive in water 

 containing putrescent matter. 



Trichogyne of Hildebrandtia rivularis.:|: — M. P. Petit thus 

 describes the female reproductive organs of this alga, which covers the 

 stones of the public fountain of Morsang-sur-Orge. At the end of 

 June each year certain cells develop into long hairs, altogether 

 resembling the trichogyne of other FlorideaB. In the depressed parts 

 of the thallus, where the filaments are shortest, consisting of six or 

 seven cells, thickest, and of a pale red colour, a small mass of 

 gelatinous matter is developed, when the filaments soon detach them- 

 selves from the stone, and spread in the gelatine. In one of these 

 cells a small protuberance then makes its appearance, which develops 

 rapidly in the course of the next few days, and assmnes the form of a 

 hair full of refrangible matter, of a light rose colour, and containing 

 granules and vacuoles. As the plant does not here produce antheridia, 



* Comptes Eendus, xci. (ISSO) pp. 734-6. 



t 'Magyar noventyani Lapok,' iv. p. 85. See Bot. Ztg., sxxviii. (18S0) 

 p. 745. 



X Bull. Soc, Bot. France, xxvii. (1880) p. 194. Brebissonia, iii. (1880) pp. 1-5 

 (1 pl.). 



