Miscellaneous Bibliography. 139 
5 Ezexte. Hayes —Mr. Ezekiel Hayes, whose name has appeared on 
the ttle p page of this Journal as its i died suddenly on the 12th 
ay lst In all ‘elations in life Mr. ayes was a man of strict 
christian integrity; and throu ughout his connection with this Journal, he 
labored earnestly for the interests of both authors and publishers. 
} VI, MISCELLANEOUS BIBLIOGRAPHY. 
1, 1, Lippincott's Vapor Index, or Psychrometric Calculator—The Va 
‘4 Index is a mechanical contrivance by Jas. 8. Lierrxcort, Haddonfield, 
. He for finding, by inspection, the relative es of the air, from the 
ings of the wet and dry bulb t 
ee Circular card, near its tinigta. are oe taealy vege gid sgepes 
which may be seen n on a larger card over which it tu $ a series 
of numbers (from 0 to 100),. representing wet-bulb readings. Radi ally 
inward from these Openings are corresponding ones, arranged spirally, 
aud numbered from 0 to 25. These numbers are di ifferences of wet-bulb 
and dry-bulb readings. The relative humidity is read off through the 
Opening whose number is this difference in a given case, when the card 
tered that the wet-bulb reading is seen in the corresponding mar- 
na openi 
The i instrument j is simple, and many may prefer it to a table of double 
entry, for obtaining the same results; although in our view such a table, 
Printed on a smaller card than this, would be equally convenient, and 
more durable. But knowing of no such table on a card, we can reco 
mend the “ Vapor Index” as more easy of use thadr the large tables, su 
4 48 Guyot’s, and as sufficiently accurate for ordinary purposes. e wide 
distibution of the Vapor Index would tend to increase much the interest 
i making hygrometric observations. 
Mr. Lippincott i is deserving of much credit for his efforts to extend an 
interest in Hygrometry, both by this invention, and by an interesting pa- 
heli in the Report of the Commissioner of Agriculture for 1865, in which 
discusses dis relations of atmospheric aged to various important 
‘ Phenomena j : Rasieiakig Sf and Agricultu 
2. Genera ems of Shades and Shadows, formed both by parallel 
and radial riled aa shown both in com mon and in isometrical projection, 
gether with the ragit th Mls y S. Epwarp Warren, C.E., 
A ng on the science of drawing. In the work before us, the author 
tea With fulness and elicaniar the subject of shades and shadows. 
had treatises of Prof, W re all well adapted for instruction in the 
ter and suck, as to be read with interest, and understood a ae 
While its M8 scientific miscellany, and corresponde nee, reports of the 
