XXvi PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 



that the disease, whatever the cause, was of a very virulent 

 character. It was not the ordinary "spot" so well known to 

 Orchid-growers. The specimens were referred to Professor 

 Marshall Ward, who had already given some attention to the 

 subject. 



Orchid Hybrids. — Mr. H. J. Veitch exhibited Cypripedium 

 Lathamianum x , raised first at the Birmingham Botanic 

 Gardens, by crossing C. Spicerianum c? with C. villosum $ . 

 Messrs. Veitch had raised similar hybrids, and had, moreover, 

 raised hybrids from the reversed cross. Plants from all three 

 sources were shown. These agreed so closely in all essential 

 points that they must bear the same name. The fact of plants 

 obtained by crossing, and also by reverse crossing, producing 

 seedlings of almost exactly the same character, is very interesting. 

 Similar results have been obtained by Messrs. Veitch in crossings 

 which have produced Cypripedium Sedenii x , and Fuchsia 

 Dominiana x . 



Mr. H. J. Veitch also' exhibited a new hybrid Dendrobium. 

 The seed-bearing parent was D. japonicum, and the pollen parent 

 D. Wardianum. The hybrid D. Wardiano-japonicum had 

 smaller pseudo-bulbs than D. Wardianum, but the flowers were 

 nearly those of D. japonicum, but larger and with broader seg- 

 ments. They were also highly scented, as in D. japonicum. 



Canker in Apple Trees. — Professor Marshall Ward brought 

 before the Committee specimens of Apple-trees badly affected 

 with the so-called canker, on which there were numerous red 

 perithecia of a Nectria. It is probable that the initial injury in 

 this case had been caused by frost, and that the Nectria had 

 established itself in the cracks thus formed. 



Picea nobilis. — Mr. James Douglas forwarded branches of 

 Picea nobilis affected by gouty swellings, due probably to the 

 attacks of an Acarus (Phytoptus), or to iEcidium elatinum. 

 Professor Marshall Ward kindly undertook to examine the 

 specimens. 



London Fogs. — Dr. Oliver and Professor Scott presented an 

 interim report on the investigations undertaken by them respect- 

 ing the effects of London fogs on plants under glass. Specimens 

 of Orchids affected by fog had been received from Messrs. Veitch 

 & Sons, Chelsea ; and of Tomato plants from the superintendent 

 of the Royal Horticultural Society's gardens at Chiswick. On 



