Diaries of Leslie Arnold Mayo, an English mining engineer working in Siam between 1928 and 1929, covering – with all the ebullience and prejudices of a young man of his time and place – topics such as: the perils of going native ("...Imagine being tied to a black woman like Cundy – ugh. And now she has adopted a Siamese kid!!! Of course she looks after him well & is I truly believe faithful...I could never do it – pray to God that reason always controls my passion, at any rate in that respect..."); travels on company business to Penang and elsewhere in Malaya when investigating mining options and taking bores ("...The journey took just under three hours & about half the way I rode owing to broken bridges & the amount of water on the road. The cart rocked & swayed over the rutty road & there was an unpleasant smell from the oxen. The driver – an Afgan – was certainly the most villainous looking man I have ever met, he was a large & tall man wearing only khaki shorts & a dirty white shirt with a coloured handkerchief at his throat & an automatic on his hip. At Behor I stayed with Dawson – Aussie – & Agar – Irish – his assistant. The former owns a semi lode – semi alluvial mine. They live like natives, the animals run all over the "bungalow", coolies walk in at will with their hats on – but it was better than living in a Chinese shop..."); a giant iguana shot in his garden ("...I've had it skinned, the Siamese are having a feast, and I [shall] give it to Mum to make shoes of..."); tiger predations ("...Clarke was greatly excited...& decided to set four spring guns but some Chinese came in the morning & cleared the undergrowth & built a machane [a raised platform used in tiger hunting]..."); ants in his trousers ("...Scratching all morning..."); drinking and its attendant nightmares (in one being shot by a coolie and set upon by a Chinese whore); his reading (Hardy, Dickens, Hugo, Anatole France, Zane Grey, et al.), etc., in 2 one-page per day 'Roneo Indexed Diaries', comprising approximately 311 entries in the 1928 diary and 235 entries in the 1929 diary, ranging from a single line to a full-page, usually at least a paragraph or two; plus a third 'Roneo Indexed Diary for 1932, when Mayo is surveying and shooting game in Southern Rhodesia with about 60 entries, original cloth with a little wear but overall in good condition, Siam, and on voyage home, 1928-1929 (3)