REVIEW. 
293 
The average fall of the Nen between Northampton and 
Wansford is 38’7 inches per mile. The actual fall of the Nen 
from Northampton to Wellingborough is about 45ft., and the 
straight distance almost exactly 10 miles, so that probably 
the river in winding about increases the distance by 4 miles 
(14 x 38*7in. = 541‘2in. = 45* 1 ft.). Now I happen to know 
that the same zone of the Upper Lias is met with nearly on 
a level with the river at Northampton, Wellingborough, and 
Higliam Ferrers, and, therefore, we should expect to find the 
Middle Lias at somewhat the same depth from the surface at 
these places. After making due allowance for these places 
being a less distance from the line of strike than they are 
actually from Northampton, that is making them 6 miles and 
8 miles respectively from that line, we only get 7ift. dip per 
mile, as compared with 40ft. arrived at in another way. 
(To be continued.) 
11 c ii it fo. 
Report of the Rugby School Natural History Society for 1886. 8vo., 
69pp., illustrated. A. J. Lawrence, Market Place, Rugby. 
This twentieth annual report of the excellent Natural History Society 
established in connection with the famous school at Rugby certainly 
does not yield in interest to any of its predecessors. 
The report of the work done during the year includes a description 
of the development of a vivarium, in which quite a large collection of 
birds and small animals are maintained. The Archaeological Section 
has been revived, and the museum has been enriched bv the geological 
collection and library of the late J. K. Worthington. 
The “local lists” have frequently been a valuable feature in the 
report, and we find here a list of birds noticed near Rugby, by J. E. 
Kelsall ; while Mr. Wait gives a list of many plants which have been 
found in the neighbourhood since the publication of the local flora in 
the report for 1875. 
Among the papers printed we note a very interesting and well- 
illustrated account of the “ Dispersion of Seeds and Spores,” by the 
Rev. H. Friend, F.L.S. ; Mr. Seabroke (who still continues to work in 
the admirable “ Temple ” Observatory attached to the school) shows 
how the “ Motion of Stars in the Line of Sight” is measured with 
the spectroscope; and there are also descriptions of a “ Yisit to 
Wicken Fen,” the “ Natural History of Northumberland,” &c. The 
reports of the sections show that good work has been done in 
Archaeology, Meteorolog) 7 , Botany, Zoology, and Entomology.—W. J. H. 
Check List of British Mosses, from Dr. Braithwaite’s “ British 
Moss Flora,” Yol. I., price 3d., postage extra. This is a list of all the 
species and varieties enumerated and described in Yol. I. of the “ British 
Moss Flora,” and being printed on one side of the paper only will serve 
either as a check list, a note book, or as labels for the herbarium. It 
mav be had, with or without paper covers, of the author, 303, Clapham 
Road, S.W. 
