189 



]8S8, 1S.S9, mid ISOO in llin-o (lin'nviil locwiilics in Alsin-o. As n rosult 

 of Mies*' stndics tlu* ;iiitlior is led to conclndc tlnit the hnridn";' (jiiidity 

 of the leaf (duration of jilowing) is benditcd in I he liigliest degree by 

 tlie ])i(\s(Miee of large amounts of potash, |»arlicnlarly that combined 

 A\ itli oiganic acids (whicli in llic asli chnngcs to cail)onatc); by a delicate 

 structure of the ]<'af (dried leaves, weighing 1 ">() grams or less per square 

 uu'ter, he designates as delicate); ami, altlnaigh in a somewhat less de- 

 gn'C, by the i)resence of considerable (iuantiti»'s of organic nitrogenous 

 substances, espeeially nicotine, which at the same time has an et1"e<'t on the 

 (|Uidity of tlie product in general, and l)y a n(»ticeable content of saltpeter. 

 Deliinieiilal to the burning (piality were tituud to be first of all the chlo- 

 rine compounds, as already mentioned; a coarse structure of the leaf 

 (leaves weighing L'(H> grams or nu)re per square meter of dry leaf are 

 designated coarse) ; and, in a less degree, the presence of any consider- 

 al)le amounts of ammonium salts, phosphoric acid, resinous substances, 

 or calcium salts. 



The i)resence in the same leaf of conditions both favorable and uti fa- 

 vorable to burning quality, which in a test tend to cover ui) the <*t1'ects 

 of any single conq»ound (tr condition, makes it very ditlicult to deter- 

 mine the efCects of any single factor. For this reason Xessler* and 

 later A. ]\rayer+ have studied this matter by impregnating paper with 

 various materials and observing the effect on the duration of glowing. 

 The author jmrsued this course, using tilter i>ai)er, which of itself 

 gk>wed .") seconds, and straw paper, which glowed 15 seconds, and 

 im])regnating in separate instances with 2 per cent solutions of potas- 

 sium or sodium phos])hate, a '> per cent alcoludic soluti(m of resin, and 

 a solution of 10 grams of fresh liquid ef^<^ albumen in ]0(l c. c. of 

 water. The results M'ith both papers plainly show that in these 

 trials the phosjdiates, in ])articular potassium i)hos]»hate, ami the 

 resins are very <letrinuMital to tlie luotracted ghtwing, and tend rather 

 to induce charring; the albuniiiioids, on the contrary, favored a pro- 

 tracted glowing. 



The results of A. Mayer's J investigations led him to suggest the 

 impregnation of tobacco of poor burning quality with a half per cent 

 solution of either acetate or nitrate of j^otash by submerging for 24 

 hours, lie states that he has been able l)y this treatment to change a 

 poorly burning tobacco, which for this reason could only be used for 

 snutt', to a tobacco of a good burning quality, giving a snow-white ash. 



Composition of tomatoes. N. Passerini [Staz. Sihi: Af/ray., i^s', 

 pp. r>irj-r)72; nhs. Jour. Chem. Soc, (JO, p. !)')()). — According to the inves- 

 tigations of Passerini the fresh fruit of tomatoes consists of 1,;> i)er cent 

 skin. *.ti;,L» ])er cent i)ulp and juice, and 2.;") per cent seeds. The pulp 

 contains two coloring matters, a yellow amorphous substance, and a 



Dor Tabak, Mannheim. 1867, t I.andw. Vcr.s. Stat., 38, p. 130, 



X Laiidw. Vers. Stat.. 38, p. 138. 



