The Berg has scanned all their MT holdings. You can take a look at the 1905
MS here
https://digitalcollections.nypl.org/items/9a56aa10-2aca-0132-a78d-58d385a7bbd0
MTP has some 1906 fragments. as well

On Thu, Oct 17, 2019 at 4:30 PM Barbara Schmidt <[log in to unmask]>
wrote:

> Does the original manuscript for HORSE’S TALE survive? It might be
> interesting to check for possible alternatives that Twain considered for
> that phrase.
>
> Barb
>
> On Thursday, October 17, 2019, Leslie MYRICK <[log in to unmask]>
> wrote:
>
>> The context seems to imply that Soldier Boy is claiming that his dam was
>> not an Arabian (alkali =~ desert?).
>> Beyond that maybe this is something along the lines of the "solitary
>> oesphagus" /swallow pun?
>> Leslie
>>
>>