374 
Loan Collection of Scientific Apparatus. [July, 
III. Apparatus for measuring Gases and for determining the 
Solubility of Gases in Water. 
No. 19 is an apparatus with a graduated tube, probably 
used by Dalton for the determination of the laws regulating 
“ The Absorption of Gases by Water and other Liquids,” 
read Odtober 21st, 1803 (“Manchester Memoirs,” 2nd Series, 
vol. i.). 
No. 20 is a graduated glass tube attached to a bottle of 
india-rubber, also probably used in his researches on the ab- 
sorption of gases by water. 
No. 21, No. 22, are divided eudiometer tubes, employed 
by Dalton for measuring the volumes of gases. 
No. 23 is a spark eudiometer. 
Nos. 24, 25, 26 are glass tubes, pipettes, and funnels, gra- 
duated by Dr. Dalton and used by him for measuring gases. 
No. 27 is a graduated glass bell-jar, used for measuring 
gases. 
No. 28 is a phial, with graduated tube attached by cement, 
for collecting and measuring gases. 
Nos. 29, 30 are stoppered phials, with the bottoms cut off, 
used as gas jars for collecting and measuring gases. 
No. 31 is 1000 grains specific gravity bottle, with its 
counterpoise of lead stamped “ 175 ” by Dalton, and paper 
labelled in his handwriting “ bottle balance.” 
No. 32 is a pipette. 
No. 33, square bottle of thin glass, fitted with brass caps, 
and probably used for the determination of the specific gra- 
vities of gases. 
No. 34 is an earthenware cup, used by Dalton as a mer- 
cury-trough, and containing a small phial with mercury. 
Nos. 35, 36 are bulb tubes, with graduated scales, serving 
for the determination of the coefficients of expansion of gases. 
No. 37 is a Florence flask with cork and valve for deter- 
mining the specific gravity of gases. 
No. 38 is a glass alembic. 
IV. Weights , Balances, Apparatus, Reagents, and Specimens 
used by Dalton. 
No. 39, eleven phials, containing creosote, iodine, amal- 
gam of bismuth and mercury, quercitron bark, grana syl- 
vestra, cochineal, and other substances, labelled in Dalton’s 
handwriting. 
No. 40, three divided blocks, used by Dalton for the illus- 
tration of his lectures : these are not, however, the balls an 
