286 Miscellaneous Bibliography. 
to a country with such large maritime interests, such a territory to 
survey, and we a add, one that is so honorably known for its 
astronomical scie 
2. Sound: ae course of eight lectures, ée.; by Joun TYNDALL 
LL.D., F.R.S., &e. &e. London. Lo origman, Greens & Co. 1867. 
—This work on sound by Dr. Tyndall, is a aac exposition 
of the eres phenomena of — and especially of what may 
be termed Opt-acoustics. It is a stenographic report of eight lec- 
tures delivered at the Royal hiatstonion Such books have nearly 
the life and freshness of the spoken ih while they have this 
advantage over the latter, that the experiments mever misca 
and “oy t all who are addressed have an equal opportunity of see- 
ing an nore 
in air (pp. pee “m one among Bsyer Bon instances ee a co 
of felicitous expression scarcely ever seen outside of poetry, We 
refer to his i of Wheatstone’ 8 Ftelephanie concert, i (pe —- 
hi on heat, the author appe — more prominently 
asa discoedtens in the present work, original labors are not rot watt 
ing, but he is mainly an expositor of the nhosidees of others, and 
most ere nema of A aera 1z, 
e true source 0: mbre ” in musical sounds, the composition 
of vowel samme’ se de e origin of resultant tones, as given int the 
under which its constituents are united. Before Helmholz, men 
= attri ibuted timbre to the union of subordinate sounds with 
| “the orbit. Hel: 
“rt ri 
; * Die Lehre a. m. aS eS il 1865. 
- a 2 
a tee« 
