216 WILLIAM HENRY HARVEY 



first time the examination of which convinced Harvey that 

 the Orkney plant was only a variety of Chrysymenia rosea 

 (Lomentaria rosea Thuret). Mrs Gatty became a useful ally 

 in the collecting of seaweeds, and a valued friend ; Harvey's 

 influence is seen in her British Seaweeds ; published in 1863. 



The year 1851 saw the completion of the Phycologia Britan- 

 nica, and he at once set to work on his Nereis Boreali- Americana, 

 published in three parts in the Smithsonian Contributions to 

 Knowledge a work of 550 quarto pages containing an account of 

 all the known species of North American Algae, and 50 coloured 

 plates, lithographed as usual with his own hand a fine piece of 

 work, and one which has not yet been superseded. This was a 

 time of strenuous labour, for already he was planning a still 

 more extended foreign tour ; but he found time in the autumn 

 of 1852 for a trip to Switzerland with Sir William Hooker and 

 other friends. 



In August, 1853, Harvey set out on the most extended 

 scientific expedition of his life. So far his collecting had been 

 done in Europe, South Africa, and North America. Now he 

 was to visit the Indian Ocean and Australasia, and to investigate 

 their seaweed flora, as yet but little known. 



A short stay was made in Egypt, and a sea-shore ramble at 

 Aden yielded Padina pavonia and a few other seaweeds, but 

 otherwise he made no stop till Ceylon was reached. There he 

 travelled a good deal, but seaweed collecting was not so success- 

 ful as he had hoped. Some of the places explored proved 

 unproductive, and the prevalence of the monsoon rendered 

 collecting difficult or impossible. But the last three weeks, 

 spent at Belligam Bay and Point de Galle, yielded excellent 

 results, and he proceeded to Singapore en route for Albany, with 

 a collection of about 5000 specimens of Algae. 



The first work in Australia was done in the extreme south- 

 west. Here he gathered seaweeds assiduously in King George's 

 Sound, but the ground proved rather poor, though one welcome 

 storm brought him a rich harvest, of which he preserved 700 

 specimens in one day. He moved on to Cape Riche, to the 

 eastward, travelling through the bush on foot, and thus making 

 intimate acquaintance with the interesting vegetation as well as 



