81 
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 gravities of gases; No. 34 is an 
earthenware cup, used by Dalton as a mercury-trough, and 
containing a small phial with mercury; Nos. 35, 36 are 
bulb-tubes, with graduated scales which may have served 
for the determination of the coefficients of expansion of 
gases ; No. 37 is a Florence flask with cork and valve for 
determining 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 
sylvestra cochineal, and other substances, labelled in Dal- 
ton’s handwriting. No. 40, three divided blocks, used by 
Dalton for the illustration of his lectures; these are not, 
however, the balls an inch in diameter (referred to in his 
latest memoir on the “ Analysis of Sugar ”) which he em- 
ployed occasionally in his lectures, as illustrating his newly- 
discovered laws of combination and the atomic theory; 
these appear, unfortunately, to be no longer in existence. 
No. 41 is a common pair of scales used by Dalton ; No. 42, 
a pair of apothecary’s scales and weights employed by 
Dalton, with a paper of weights made of wire, labelled in 
his handwriting, “ 100th grains.” No. 43 is a box of weights 
Used by Dalton, and containing a pill box labelled “Platina,” 
another pill box labelled “ Hund,” and containing 100th of 
grains, and another wooden box containing brass gramme 
Weights, labelled “ Weights, French;” the other ordinary 
weights are of lead. No. 44 is Dalton’s pocket balance, 
consisting of a small pair of apothecaries’ scales, with beam 
about 4 inches long, and having the pans attached by 
common string ; it is contained in a tin case for the pocket. 
