238 THE ENTOMOLOGIST. 
July last, and coloured drawings of the larva and pupa. Mr. 
Goldthwaite, a bred series of Scotosia vetulata; black formso* 
Eupithecia rectangulata; and a long series of Nudaria mundana. 
—H. W. Barker, W. A. Pearce, Hon. Secs. 
REVIEWS. 
The Naturalist's Diary: a Day-book of Meteorology, Phenology, 
and Rural Biology. Arranged and edited by CHaRrLEs 
Roperts, F.R.C.S., &c. London, 1886: Swan, Sonnen- 
schein & Co. 
Tus is a spirited stride away from the well-worn track fol- 
lowed by ordinary diary-makers. So marked indeed is the 
difference that Mr. Roberts’s system is worthy of serious study 
and lengthened consideration. It is no mere series of pages, 
though there is a page per diem for entering the names of animals 
observed on a particular day; but a carefully prepared guide for 
scientific record of observations, based upon the study of phe- 
nology, and the “interdependence of a wide range of natural 
phenomena;” in other words, examining the relations which 
exist between the meteorological and organic phenomena around 
us and their dependence on each other. 
“ Calculations are given which show the degrees of shade temperature 
above 42° F. (the assumed zero of vegetation) for each day, and the 
accumulated temperature from day to day throughout the year; and the 
rainfall is dealt with in a similar manner. In this way, and as far as the 
average of twenty years can be trusted, the heat and moisture equivalents 
of about three hundred British wild plants and trees have been determined ; 
and these plants have become in their turn standards for estimating the 
same conditions in other plants which have not been under observation, 
but which grow and blossom under similar atmospheric and physical 
_ surroundings. Thus the plants which blossom on May 4th required an 
accumulated temperature (above 42°) of 479° F. and an accumulated rain- 
fall of eleven inches, to bring them to that condition, and in fact their 
blossoming, either on that or on any other day, shows that there has been 
an accumulated temperature and moisture to the amount just stated.” 
In a like manner do these correlations extend to insects and 
other animals, so that to the entomologist this field of study is 
open, and will be found much more interesting than the mere 
