548 The American Naturalist [June, 
transverse leaves last. [A diagram was here presented show- 
ing these results in part, with the rate per day of growth, also 
the slowly diminishing rate of growth of the leaf as it ap- 
proached completion.] 
Of course a number of considerations occur at once to mod- 
ify the wholesale use of this conclusion. The relative size of 
the leaves compared should be similar, the condition of health- 
fulness of the plants alike, the nature of the plant tissue nearly 
the same, and the position and aspect of the leaves, as regards 
favorable or unfavorable conditions for growth, identical. The 
subject is suggestive, and carefully followed up might lead to 
interesting results. 
Mr. Arthur HoUick showed fossil leaf impressions in ferru- 
ginous sandstone, found near Arrochar Station by Mr. Gil- 
man S. Stanton. They are undoubtedly from the same 
formation as those from Tottenville (Cretaceous ?) described in 
the Proceedings of December 8, 1883, and like them, were 
not in place where found, but occurred in Drift rocks. The 
specimens are too fragmentary for determination, but the fact 
of their discovery at this new locality is a matter of interest 
and is therefore placed upon record. 
Specimens of bowlder clay from the same locality were also 
shown. It has been lately utilized for brick making. There is a 
fine exposure of modified drift, overlaid by bowlder drift, 
where the railroad has been cut through. 
Dr. A. L. Carroll noted the discovery on Staten Island re- 
cently of Bothryocephalus latus — the first reported occurrence 
of this parasitic worm in America. 
Specimens of the " Large Mocker Nut," Hicoria alba, (L.) 
Britton, var. maxima (Nutt., Britton.), were presented — being 
an addition to the local flora. They were collected by Dr. 
Britton near Court House Station. 
February 9, 1889. Mr. Chas. W. Leng read a paper upon 
" The Buprestidas of Staten Island," illustrated by specimens 
of the species mentioned. 
It is thought that the larvae of many species take years to 
perfect their growth, and an instance is recorded of a Bupres- 
tis emerging from the wood of a desk that had been in use for 
twenty years. One of our commonest species. Chrysobothrts 
femorata is, however, said by Packard to complete its trans- 
formations in twelve months, so the usual period is uncer- 
tain. 
This insect is found every year in numbers on oaks and 
