44.2 Instructions for the Collection 
perature, and moisture in the soil, retarded its progress throughout the 
month of June. The laburnum came in flower on the 8th, and the mul- 
berry in leaf on the 9th, 4 days later than last year; the Baddlea globosa on 
the 25th, or 9 days later than last year; and the Tradescantia discolor on 
the 26th. The wheat-fly began to appear, in warm sheltered situations, by 
the 22d; and the temperature falling to 38’ in the open air, on the evening 
of that day, the first crop of these marauders was killed outright. It was 
prevented from laying its eggs on the wheat-ear, by brisk winds, except on 
the evenings of the 23d (when they were only a few hours in the fly state), 
and on the evenings of the 27th, 29th, and 30th: so that the early part of the 
crop has not been so severely injured as last year. Throughout the whole 
of July, the air was exceedingly moist; and, till near the end, the tem- 
perature was low, the atmosphere cloudy, and rains frequent though sel- 
dom heavy: plants, consequently, elongated without maturation. The 
white single campanula (Campanula persicifolia) opened its blossom on the 
8th, the same day as last year; and, like last year, it was late in July before 
hay-cutting could commence, by reason of the rains. Peas that brairded 
in the field on the 3lst of March came in flower on the 12th, a period, 
from the time of brairding, of 103 days: mean temperature of that period 
50°8°. China wheat seeds from Mr. Loudon, sown on the 24th of March, 
brairded on the 10th of April, and came in the ear in the open ground on the 
12th of July, a period, from the time of brairding, of 93 days: mean tem- 
perature of that period 51°. The Hordeum ntidum seeds, also from Mr. 
Loudon last year, that brairded in the field at the same time with common 
barley, came in the ear also at the same time on the 16th; a period, from 
the time of brairding (p. 392.), of 101 days: mean temperature of that 
period 51°5°. Oats which brairded on the 24th of April, came in the ear on 
the 24th; a period, from the time of brairding, of 91 days: mean tempera- 
ture of that period 52°9°.. Last year, oats came in the ear in 74 days, in the 
same park, from the time of brairding ; but the temperature was 1°5° higher, 
and the moisture in the soil less copious, during the early stage of the 
plant’s growth. The wheat A‘phis appeared to join the Cecidomyia tritici 
in completing the ruin of the Carse farmer on the 28th and 29th: a thunder 
storm, with a heavy fall of rain, swept them off on the evening of the 30th, 
and left the maggots, and their black foes the ichneumons, in quiet posses- 
sion of the ear. During these two days, the ears in many fields were lite- 
rally covered with the brown-coloured A’phis: they now lie dead on the 
surface of the ground, except on awned or bearded wheat, where they have 
been in some measure protected from the inclemency of the weather. — 
A.G. Aug. 2. 
Art. VIL. Lnstructions for the Collection of Geological Specimens. 
(Copy of a Paper issued by the Geological Society.) 
1. THE Geological Society begs to impress upon the minds of all collec- 
tors, that the chief objects of their research should be specimens of all 
those rocks, marls, or clays, which contain shells, plants, or any sort of 
petrifaction. 
2. The petrifactions should, if possible, be kept united with portions of 
the rock, sand, or clay, in which they are found; it being more desirable 
that the mass should be examined carefully when brought to England, than 
that any separation of the shells should be attempted at the time of their 
collection. This injunction, however, does not apply to those cases in 
which the shells fall readily from their surrounding matrix ; but, in this 
event, great care must be taken of the petrifactions, by rolling them in 
paper, or some soft material. : 
3. If several varieties of stone are seen in the same cliff or quarry, and 
