[ ^ ] 



XLI. Defcription of an improved Gas-holder, hy 

 Dr. Warwick. 



sir, To Mr. Tilloch. 



Jl\S fimplieity and cheapnefs are objects of confiderable 

 importance in the conftru&ion of chemical apparatus, I 

 fliall make no apology for recommending to your readers a 

 lefs.expenfive alteration in the air-holder of Mr. Watt, than 

 that defcribed by Mr. Pepys in your laft number. I contrived 

 it upwards of two years ft nee, and find it anfvvers every purpofe 

 for which it was intended. A ftop-cock, foldered to the fhorter 

 tube in the top of the gas-holder, and a rim fufficiently deep 

 to permit the water to rife an inch above the ftop-cock, will 

 enable thofe fond of pneumatic experiments to transfer oxygen 

 (or any other) gas with the utmoft readinefs to any veflel they 

 pleafe. (See Fig. 3. Plate V.) The ftop-cock has no fcrew, 

 the blow-pipe having a focket fitting the tube with fufficient 

 accuracy to prevent the efcape of air. A perufal of the com- 

 munication of Mr. Pepys will render a more minute defcrip- 

 tion unneceflary. Thofe perfons to whom expenfe is of no 

 confequence will moft likely prefer that contrived by Mr. 

 Pepys, which is in fome refpe£ts, perhaps,, more convenient 

 than that of which I have fent you a (ketch ; but of this every 

 one muft judge for himfelf. I remain, Yours, &c. 



Rotherhain, Aug. 9, 1802. T. 0. WARWICK, 



XLII. Remarks on the Clathrus canceliatus (Linu.) and 

 two other Species of Fungus. By B, M. Forster, Efq* 

 Communicated by the Author. 



JL HE very near refemblance which the Clathrus can- 

 cetlatus bears in feveral refpecls to the Phallus impudicus 

 and Phallus caninus, appears fufficiently ftrbrig to jultify 

 the arrangement of them all under one genus, although not 

 fo considered by Linnaeus, and I have ventured to form ge- 

 neric and fpecific characters as follow : 



Generic Chnracler. 

 Clathrus. 

 Vulva coriacea. Corpus cavusj cellujofus, pertufus. Senuna in 

 glutine immerfa. 



Specific Chambers. 

 Cl. cancellatus, corpore globofo, feneftrato. 

 Cl. fileatus, corpore cylindrico, pileo favofo. 

 Cl. capitulatus, corpore cylindrico, capitulo corrugato. 



For 



