I. Remsen on Parasulphobenzoie Acid. 179 
“These constitute but a small fraction of the numbers of 
experiments actually made. There are very decided indica- 
tions that the amount of elongation depends on the molecular 
condition of the bar.* For example, a bar taken from a mass 
used in the manufacture of a great gun at the Mersey Iron- 
works, suffered changes on magnetization and demagnetization 
considerably less than those recorded here. I hope to return 
to the subject.” 
That the tilt of the mirror in this instrument should be con- 
troled alone by the molecular motions of the bar, was hardly to 
be expected from a critical examination of the construction of 
— 
Arr. XXL—Investigations on Parasulphobenzoic Acid ; by Ira 
REMSEN. 
Trangement, might, by a careful reéxamination, find te 
and more satisfactory explanations: and that this inexplicable 
* This fact had previously been shown by Joule’s experiments. 
AM. Jour. Sot.—Tuirp Series, Vou. V, No. 27.~ Maxcu, 1873. 
12 
