INVERTEBRATA, CRYPTOGAMIA, MICROSCOPY, ETC. 495 



in Acetabularia, where crystalloids arc found only before the spores 

 are formed. 



Acetahnlaria mcditcrranea has colourless, usually very regular 

 hexahedral crystalloids in the chambers of the pileus ; Bryopsis Bcdhi- 

 siana comparatively large quadratic or rhombic octahedra, often 

 congregated in large quantities. Cladopliora prolifera has regular 

 hexahedra. the smaller ones colourless, the larger brown. The hexa- 

 hedra of Dasycladus clavoRformis are colourless, or more often brown, 

 and exhibit obvious parallel stratification. The crystalloids of Calli- 

 tkammon grijjithsioides, Griffdlisia heteromorpha, and G. parvida re- 

 semble very acute hcxahedra or pyramids, but show a six-sided trans- 

 verse section, or have the form of thin, not very regular, six-sided 

 plates. Those of G. setacca and G, Schoushcei resemble octahedra, 

 while those of Lanrencia sp., Polysiplicmia purpurea, and P. funehris are 

 clearly octahedra, and those of P. sanguinea very acute elongated 

 rhombs, probably pyramidal. 



The author was unable to detei-mine with certainty from algai 

 preserved in alcohol or dilute glycerine the crystalloid red substance 

 termed by Cramer rhodospermiu. Only in I'eysonnelia he found red 

 bodies, which could not be more closely examined in consequence of 

 their small size ; and in two dried Florideaj irregular angular bodies of 

 various size, of a bright carniiue-red colour, wliich behaved with 

 reagents like crystalloids, and might possibly be imperfectly formed 

 rhodospcrmin. 



MICEOSCOPY, &c. 



Haris and Power's Physiological Manual. — Dr. Haris and 

 Mr. DArcy Power, the Demonstratur and Assistant-Demonstrator of 

 Physiology at St. Birtholomew's Hospital, liave just jjublished * a 

 small Manual for the Physiological Laboratory which should be of 

 considerable service, as it contains very useful practical information. 

 " An epitome of histology " accompanies the i)ractical directions, of 

 which the following are samjdes: — 



" Preparing for Mounting. — Specimens may be mounted at once in 

 glycerin after cutting, staining, and wasliing in distilled water; but 

 if it be desired to preserve in Canada balsam or dammar, the sections 

 must pass, after staining, through — 



la) Methylated spirit 1 , .1 ■ 



\b) Absolute alcohol \ *" ^'""^^^^ ^^'^ "'^*^^- 



(c) Clove oil, oil of turpentine, or benzol | ^^ ''^^^'^^ *^^™ ^'•^"s- 



They must remain in alcohol for live to ten minutes, and in clove 

 oil for the same time." 



'■'■ Elastic Tinmc.- — •Prei)aration — Tease out a small piece of tlie 

 ligamentum nuchjc of an ox in glycerin, and examine. 



" Structure. — Elastic fil)res are thick and well defined ; tlicy do not 

 form bundles ; they branch dicliotomously and anastomouc with each 



* 8vo, Uaillim-, Tin«lul, & ('i..x, l/uidoii. 1880, 11:5 |>|i. 



