” 
7 
110 . ¥ _ Scientific Intelligence. 
soluble in watelcntoapinliieh is brilliant black when. dried. . If 
the solution of sugar and bichlorid of tin are left to spontaneous evap- 
oration at the ordinary temperature, the color soon becomes brown, and. 
gradually deepens; and at the end of a year or eighteen months, 1t Is_ 
changed to a uniform jelly of a lustrous black color. The same result 
heat. 
A test cloth of some woollen fabric, such as white merino, is to be 
applied Pe three or four minutes in a solution of one pint bichlorid of 
tin and two pints of water, the liquid allowed to drain off and the merino 
dried in a water-bath, For testing ron a drop of the urine is to be 
put on a strip of the stuff, and held over a red ~ charcoal ora candies 
not be used in place (s a Ordinary urine and its constituents are 
not darkened by this 
Bichlorid of seiciny, chlori d > So and other chlorids may 
compounds, as ligneous fibre, cotton, pape rch. 
The author also suggests that the reaction of sugar and sajacinrtidd 
of tin _— produce a brown paint that will become very important in 
the a 
i] 
‘es 
= 
PR ne FEA day Fe 
soo ‘On Iodine in fresh water Plants ; by Av. Cuatiy, (L’Institut, 
847.)—It is known that iodine has been detected by Maller in the cress, 
occurrence. e examined with success ei cress about Paris, and on 
extending his researches, found it in the following species. 
Iodine reaction. 
Fotamogeton —- stagnant waters “3 Gentilly, ces. 
ect 
pectinatum, the Seine, ne t. Cloud, strong. 
Arndo phragmites, — near aan, ‘ , traces 
s of St Quentin, . é . strong. 
Scins dncustr a, aise. : ; : , . traces. 
nentin, ‘ ‘ ‘ . strong. 
Typha latifolia, St. Quentin, : ‘ ‘ é . 
Littorella lacustris, St Que “ 
‘eon ee aquatilis var. iteropiylas, pools of water. 
of 
ory, 
Sagittaria sagittifolia, the Seine, near Neuilly, 
Chara fetida, turfy waters, Gentilly, ; ; - traces. 
Conferva crispata, Seine, near St. Cloud, . ‘ 
Pontinalis antipyretica, pond near Charenton, . 
asturtium amphibium, Meudon, . 
* . 
es 2 
eS a 
& 20a 
s 
58 
oO 
n 
Gratiola officinalis of comme : : . 
ree, ‘ 
_ Menyanthes trifoliata, Meudon, . ee ; 4 & 
