^4-2 Listrmtions fo)' tUe 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 Buddleaglobosaon 

 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 exceecUngly 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 matiu-ation. The 

 white single campanula (Campanula /)ersicif61ia) opened its blossom on the 

 8th, thesame 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 31st 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 lOtb 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 JTordeum nudum 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 52'9f>. 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 Instructions for the Collection of Geological Specimens. 

 ; ' (Copy of ^ 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 jseen in Xhe same cliff or quarry, and 



